Seagate 2TB Barracuda http://www.amazon.co...roduct/B005T3GRN2 for my AMD box that's under construction (soon).
I believe the partitioning (at least on Winders) goes through another "barrier" shortly above 2 TB, so I'd be nervous about using a 3TB or larger drive on Winders unless I knew all the ramifications.
For OSX it probably doesn't matter. Someone put 2 SSDs and a 3TB drive in an iMac - http://forums.macrum...ead.php?t=1307367
I'd avoid "Green" drives unless you know how to turn off the automatic spin-down, etc.
HTH.
Cheers,
Scott.